In this article, we will write a recursive Java function length(String s) that computes the length of the string s.

package com.topjavatutorial.app;

import java.util.Scanner;

public class StringDemo {

  public static void main(String[] args) {

    System.out.println("Enter a String: ");
    Scanner sc = new Scanner(System.in);
    String s = sc.nextLine();
    sc.close();
    System.out.println("Length of the string is: " + length(s));
  }

  private static int length(String str) {
    if (str.equals(""))
      return 0;
    else
      return length(str.substring(1)) + 1;
  }

}

Output :

Enter a String:
hello
Length of the string is: 5

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